[Bug 1881207] Re: systemd-networkd brings eno1 up and down repeatedly

Fri May 29 10:34:23 UTC 2020

To clarify:

- I'm now running version `237-3ubuntu10.41` of both `systemd` and `libsystemd0`.
- With the DHCP MTU option removed, the network interface comes up correctly and remains stable.

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Title:
  systemd-networkd brings eno1 up and down repeatedly

Status in systemd package in Ubuntu:
  New

Bug description:
  Running on a NUC (BOXNUC8i7BEH3).

  After updating the `systemd` package past `237-3ubuntu10.32`, I see
  the onboard NIC link being taken down / up repeatedly, as shown below
  (dates are from my original notes, but the issue remains the same
  today).

  The NIC fails to remain up, and all networking is out of action.

  Running `systemctl stop systemd-netword` stops this and leaves the NIC in an unknown state.
  Subsequently running `ifconfig eno1 up && dhclient eno1` allows networking to continue basic operation, albeit without systemd's oversight.

  My original solution was to downgrade both the `libsystemd0` and
  `systemd` packages to `237-3ubuntu10.28`.

  After attempting an `apt update && apt upgrade` again today, exactly
  the same thing is happening with `237-3ubuntu10.41`.

  Good versions:
  - 237-3ubuntu10.28
  - 237-3ubuntu10.32 (currently in use, and held)

  Bad versions:
  - 237-3ubuntu10.33
  - 237-3ubuntu10.38
  - 237-3ubuntu10.41

  dmesg:

  [  360.711367] e1000e: eno1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
  [  360.714370] e1000e 0000:00:1f.6 eno1: changing MTU from 1500 to 9000
  [  360.726189] e1000e 0000:00:1f.6: Interrupt Throttle Rate off
  [  361.733073] e1000e 0000:00:1f.6 eno1: changing MTU from 9000 to 1500
  [  361.744146] e1000e 0000:00:1f.6: Interrupt Throttle Rate on
  [  366.760198] e1000e: eno1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
  [  366.763375] e1000e 0000:00:1f.6 eno1: changing MTU from 1500 to 9000
  [  366.776060] e1000e 0000:00:1f.6: Interrupt Throttle Rate off
  [  367.781718] e1000e 0000:00:1f.6 eno1: changing MTU from 9000 to 1500
  [  367.792796] e1000e 0000:00:1f.6: Interrupt Throttle Rate on
  [  372.808660] e1000e: eno1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
  [  372.811537] e1000e 0000:00:1f.6 eno1: changing MTU from 1500 to 9000
  [  372.823648] e1000e 0000:00:1f.6: Interrupt Throttle Rate off
  [  373.830436] e1000e 0000:00:1f.6 eno1: changing MTU from 9000 to 1500
  [  373.841512] e1000e 0000:00:1f.6: Interrupt Throttle Rate on

  journalctl -u systemd-networkd:

  Jan 06 18:04:05 patch systemd-networkd[755]: eno1: Gained carrier
  Jan 06 18:04:05 patch systemd-networkd[755]: eno1: DHCPv4 address 10.42.0.5/24 via 10.42.0.3
  Jan 06 18:04:05 patch systemd-networkd[755]: eno1: IPv6 successfully enabled
  Jan 06 18:04:05 patch systemd-networkd[755]: eno1: Configured
  Jan 06 18:04:06 patch systemd-networkd[755]: eno1: Lost carrier
  Jan 06 18:04:06 patch systemd-networkd[755]: eno1: DHCP lease lost
  Jan 06 18:04:06 patch systemd-networkd[755]: eno1: IPv6 successfully enabled
  Jan 06 18:04:11 patch systemd-networkd[755]: eno1: Gained carrier
  Jan 06 18:04:11 patch systemd-networkd[755]: eno1: DHCPv4 address 10.42.0.5/24 via 10.42.0.3
  Jan 06 18:04:11 patch systemd-networkd[755]: eno1: IPv6 successfully enabled
  Jan 06 18:04:11 patch systemd-networkd[755]: eno1: Configured
  Jan 06 18:04:12 patch systemd-networkd[755]: eno1: Lost carrier
  Jan 06 18:04:12 patch systemd-networkd[755]: eno1: DHCP lease lost
  Jan 06 18:04:12 patch systemd-networkd[755]: eno1: IPv6 successfully enabled
  Jan 06 18:04:17 patch systemd-networkd[755]: eno1: Gained carrier
  Jan 06 18:04:17 patch systemd-networkd[755]: eno1: DHCPv4 address 10.42.0.5/24 via 10.42.0.3
  Jan 06 18:04:17 patch systemd-networkd[755]: eno1: IPv6 successfully enabled
  Jan 06 18:04:17 patch systemd-networkd[755]: eno1: Configured
  Jan 06 18:04:18 patch systemd-networkd[755]: eno1: Lost carrier
  Jan 06 18:04:18 patch systemd-networkd[755]: eno1: DHCP lease lost
  Jan 06 18:04:18 patch systemd-networkd[755]: eno1: IPv6 successfully enabled

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.32
  ProcVersionSignature: Ubuntu 4.15.0-101.102-generic 4.15.18
  Uname: Linux 4.15.0-101-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  Date: Thu May 28 23:19:27 2020
  InstallationDate: Installed on 2019-06-20 (343 days ago)
  InstallationMedia: Ubuntu-Server 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0dc6:3401 Precision Squared Technology Corp.
   Bus 001 Device 002: ID 0403:6014 Future Technology Devices International, Ltd FT232H Single HS USB-UART/FIFO IC
   Bus 001 Device 004: ID 8087:0aaa Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Intel(R) Client Systems NUC8i7BEH
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-101-generic root=UUID=d03ca5b0-7a00-42da-a3a8-e065dcf6dd07 ro
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/13/2019
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: BECFL357.86A.0064.2019.0213.1122
  dmi.board.name: NUC8BEB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: J72688-305
  dmi.chassis.type: 3
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 2.0
  dmi.modalias: dmi:bvnIntelCorp.:bvrBECFL357.86A.0064.2019.0213.1122:bd02/13/2019:svnIntel(R)ClientSystems:pnNUC8i7BEH:pvrJ72992-305:rvnIntelCorporation:rnNUC8BEB:rvrJ72688-305:cvnIntelCorporation:ct3:cvr2.0:
  dmi.product.family: Intel NUC
  dmi.product.name: NUC8i7BEH
  dmi.product.version: J72992-305
  dmi.sys.vendor: Intel(R) Client Systems

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